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作 者:吴珂 陈慧敏 曾山佰[2] 郁泰立 吴俊梅 夏蕴玉 汪婷 王晓春 WU Ke;CHEN Huimin;ZENG Shanbai;YU Taili;WU Junmei;XIA Yunyu;WANG Ting;WANG Xiaochun(Meteorological Bureau in Kunshan City,Kunshan 215337,China;Meteorological Bureau in Suzhou City,Suzhou 215000,China)
机构地区:[1]昆山市气象局,江苏昆山215337 [2]苏州市气象局,江苏苏州215000
出 处:《中国环境监测》2024年第5期31-41,共11页Environmental Monitoring in China
基 金:江苏省重点研发计划项目(BE2019387);苏州市科技计划项目(SS2019033)。
摘 要:为研究2022年新冠疫情期间管控措施对昆山市空气质量产生的影响,分析了疫情前期及管控期大气污染物(尤其是臭氧O_(3))浓度的变化特征,并对O_(3)的空间分布、成因及来源进行了解析。结果表明:疫情管控后,一次污染物浓度呈递进式降低,而O_(3)日最大8 h滑动平均质量浓度(O_(3)-8 h)显著上升,其中管控中期的污染最严重,明显超过历史同期水平。空间分布上O_(3)-8 h高值区主要集中在市区西部(高新区)及西北部区域,较2021年增幅显著。NO2浓度下降比与O_(3)-8 h上升比的空间分布呈现出良好的对应关系,NO2降幅高的区域O_(3)-8 h增幅也高,同时两者浓度变化呈非线性相关,当NO2浓度达到一个临界值时,O_(3)浓度随之出现下降。典型污染过程中O_(3)日变化仍为显著的“单峰型”,但振幅明显增大,O_(3)与气温、能见度、日照呈显著正相关,与相对湿度和气压呈显著负相关。结合风向及后向轨迹聚类分析来看,此次污染气团主要来自浙江、安徽等地,占总气团输入的64%左右。In order to study the impact of control measures on air quality in Kunshan City during the COVID-19 pandemic in 2022,this paper analyzed the variation characteristics of atmospheric pollutants,especially ozone concentration during the preepidemic and control periods,the spatial distribution,causes and sources of ozone pollution were researched.The results showed that under the pandemic control measures,the concentration of primary pollutants decreased progressively,while O_(3)-8 h concentration increased significantly,and the pollution was the most severe during middle period of epidemic control,obviously surpassing the historical level in the same period.The high values of O_(3)-8 h were mainly concentrated in the western(New&High-tech Industrial Development Zone)and northwestern areas of the city,showed a significant increase compared to 2021.The spatial distribution of the reduction rate of NO2 and the rise rate of O_(3)-8 h showed a good correspondence,the regions with high NO2 reduction also had high O_(3)-8 h increase.They also showed a nonlinear correlation,when the NO2 concentration reached a critical value,the ozone concentration decreased accordingly.The daily change of ozone showed an obvious“single-peak”pattern with a significant increase in amplitude during the typical pollution events,ozone concentration was significantly positive correlation with air temperature,visibility and sunshine,and negative correlation with relative humidity and air pressure.Combined with the wind direction and backward trajectory cluster analysis,the air masses of pollution mainly came from Zhejiang Province,Anhui Province,accounting for about 64%of the total input air masses.
分 类 号:X823[环境科学与工程—环境工程]
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